JotForm is an online form builder where you can quickly and easily build complex forms by simply dragging and dropping the questions and various form fields on to the canvas.
JotForm supports all the standard form fields but the tool also lets you insert special fields like Sliders, Star Ratings, Date pickers and Matrix for more complex surveys. You can integrate your form with Filepicker and that will allow visitors to directly upload files to your form from Dropbox, Google Drive and other cloud storage.
Payment services such as PayPal or Google Checkout can be added to the form as well.
JotForm is free for 100 submissions per month.